# std::basic_osyncstream<CharT,Traits,Allocator>::operator=

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< cpp‎ | io‎ | basic osyncstream

basic_osyncstream& operator=( std::basic_osyncstream&& other ); |  | (since C++20)

Move-assigns a synchronized output stream:

Move-assigns the wrapped std::basic_syncbuf from the corresponding member of other (after this move-assignment, other.get_wrapped() returns a null pointer and destruction of other produces no output; any pending buffered output will be emitted) and move-assigns the base std::basic_ostream (this swaps all stream state variables except for `rdbuf` between *this and other)

### Parameters

other | - | another synchronized output stream to move from

### Return value

*this

### Example

Run this code

    #include <iomanip>
    #include <iostream>
    #include <sstream>
    #include <syncstream>
    #include <utility>

    int main()
    {
        std::osyncstream out(std::cout);
        out << "test\n";
        std::ostringstream str_out;
        std::osyncstream{str_out} = std::move(out); // Note that out is emitted here
        std::cout << "str_out = " << std::quoted(str_out.view()) << '\n';
    }

Output:

    test
    str_out = ""

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 3867 | C++20 | the move assignment operator was noexcept, but `std::basic_syncbuf`'s move assignment operator is not | removed noexcept

### See also

(constructor) | constructs a `basic_osyncstream` object (public member function)
(destructor) | destroys the `basic_osyncstream` and emits its internal buffer (public member function)
emit | calls `emit()` on the underlying `basic_syncbuf` to transmit its internal data to the final destination (public member function)

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